Fatigue test device and test method for flywheel housing

Abstract

The invention discloses a device and a method for testing fatigue of a flywheel casing. The device comprises a base, a driving swing arm, a driven swing arm, a stress detection element, an excitation device and an acceleration detection element, wherein the flywheel casing is clamped between the driving swing arm and the driven swing arm, the stress detection element is arranged on the flywheel casing and is used for detecting the stress of the flywheel casing, the excitation device is arranged on the driving swing arm, and the acceleration detection element is used for detecting the excitation acceleration. The device and the method have the advantages that through the change of acceleration, the device is used for monitoring whether a flywheel has cracks or not; the monitoring method has an objective standard, so compared with the prior art based on manual observation, the test precision is obviously higher, and the test result is more proximate to the real state; meanwhile, the manual observation is not required, and the test safety coefficient is also improved; in addition, the excitation force is amplified under the action of the resonance, and the larger load is generated; compared with the low-frequency hydraulic loading method of the prior art, the test period is shortened; and the structure of the test device is simple, and the land occupation space is little.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a fatigue test device and a test method for a flywheel housing. Background technique [0002] The flywheel housing is installed between the engine block and the gearbox, externally connected to the crankcase, starter, oil pan, etc., and has a built-in flywheel assembly, which plays the role of connecting the body, protection and carrier. [0003] Based on this, the flywheel housing is a housing with a complex structure, and its stress and damage conditions are relatively complicated. Through statistical analysis, there are about eight failure modes of the flywheel housing, including: crack, rupture, damage (mechanical damage), size out of tolerance, shrinkage, appearance quality, unqualified size processing, and wrong assembly. [0004] Among them, about 94% of the failure modes of the flywheel housing are related to fatigue. Therefore, the fatigue test of the flyw...

AI Technical Summary

Problems solved by technology

[0007] First, the cracks caused by fatigue damage need to be monitored manually, which is highly subjective and the judgment standards are not uniform, resulting in low test accuracy and low referenceability; moreover, there are potential safety hazards when observed by humans;

[0008] Second, when the hydraulic flywheel shell fatigue test machine is used for fatigue test, due to the low hydraulic frequency, the test period is very long, and the cylinder block must be used, which occupies a large space

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